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iamjoeysox/godot_snowfall_shader.gd

Last active October 23, 2021 04:01
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Snowfall shader for the Godot game engine
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godot_snowfall_shader.gd
shader_type canvas_item;
// Be sure to set the resolution in the editor
// example 640 x 640
// Also be sure to play around with the z index and
// opacity levels on various modulate values and the final color alpha channel
// .....
uniform vec2 resolution;
float snow(vec2 uv, float scale, float time)
{
float w=smoothstep(1.0,0.0,-uv.y*(scale/10.0));if(w<.1)return 0.0;
uv+=time/scale;uv.y+=time*2.0/scale;uv.x+=sin(uv.y+time*.5)/scale;
uv*=scale;vec2 s=floor(uv),f=fract(uv),p;float k=3.0,d;
p=.5+.35*sin(11.0*fract(sin((s+scale)*mat2(vec2(7,3),vec2(6,5)))*5.0))-f;d=length(p);k=min(d,k);
k=smoothstep(0.0,k,sin(f.x+f.y)*0.01);
return k*w;
}
void fragment( )
{
vec2 uv=(FRAGCOORD.xy*2.0-resolution.xy)/min(resolution.x,resolution.y);
vec3 finalColor=vec3(0);
float c=0.0;
c+=snow(uv,30.0,TIME)*.3;
c+=snow(uv,20.0,TIME)*.5;
c+=snow(uv,15.0,TIME)*.8;
c+=snow(uv,10.0,TIME);
c+=snow(uv,8.0,TIME);
c+=snow(uv,6.0,TIME);
c+=snow(uv,5.0,TIME);
finalColor=(vec3(c));
COLOR = vec4(finalColor,1.0);
}
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